Refrigerating apparatus



May 7, 194% R. w. DOEG REFRIGERATING APPARATUS Filed Oct. 17, 1936 4 Shee'ts-Sheet 1 II, I Q W i: T w 7 A I a a i E a a w L W 3 6 0 0 a w v a a 6 w a y W 8 2 7 INVENTOR. iP/IL P11 W. D0154 ATTORNEY.

.May 7, 1940. R. w. DOEG REFRIGERATING APPARATUS Filed Oct. 17, 1936 4 Sheets-Sheet 2 8 +7 6 a m m f/ w a v w @m a W 4 I 0/0 i w h W a a w z w 2 .J Y J a a a? a w w fi a J 1 w w m I! in;

7 aw WM: w w J INVENTOR. Rum W. flag ATTORNEY.

y 7, 1940. R. w. DOEG REFRIGERATING APPARATUS Filed 001:. 17, 1936 4 Sheets-Sheet 5 ATTORNEY.

y 1940- R. w. DOEG 2,199,486

REFRIGERATING APPARATUS Filed Oct. 17, 1936 4 Sheets-Sheet 4 207 f i/J 207 22.7 I c fizz! INVENTOR.

ATTORNEY.

Patented May 7, 1940 PATENT OFFICE REFRIGERATIN G APPARATUS Ralph W. Doeg, Detroit,

assignments,

Mich., assignor, by mesne to Nash-Kelvinator Corporation,

Detroit, Mich., a corporation of Maryland Application October 1'1,

8 Claims.

This invention relates to refrigerating apparatus and more particularly to refrigerating apparatus of the compression type in which the motor and compressor are enclosed within an her- 5 metically sealed casing.

One of the objects of the present invention is to provide a. compact and efficient compression mechanism which may be readily assembled in a relatively small space.

Another object is to provide a durable and simplified type of fluid compressor of the reciprocating type having a minimum number of working parts which may be easily assembled.

Another object is to provide a motor driven fluid compressor with new and improved means of such arrangement that the motor is permitted to gain momentum before assuming the working load of the compressor, whereby to prevent possible destruction of the motor due to heavy start- 29 ing load.

With the above and other objects in view, the present invention consists in certain features of construction and combinations of parts to be hereinafter described with reference to the accompanying drawings, and then claimed.

Referring to the accompanying drawings which illustrate suitable embodiments of the present invention;

Figure l is a diagrammatic showing of a refrigeration system, employing a compressor of the present invention;

Figure 2 is a section taken approximately on line 22 of Figure 5;

a Figure 3 is a side elevation of the compressor 35 unit, a portion of the casing being broken away;

Figure 4 is an enlarged transverse section taken approximately on line 4-4 of Figure 5;

Figure 5 is an enlarged vertical section taken through the compressor unit;

Figure 6 is a section taken approximately on line 6-6 of Figure 5;

Figure 7 is a vertical section taken through a compressor unit of modified construction;

Figure 8 is an enlarged section taken approximately on line 88 of Figure 7;

Figure 9 is a vertical section through a rotary type compressor unit embodying the unloading device of the present invention;

Figure 10 is a section taken on line llll of Figure 9; and

Figure 11 is a section taken on line llll of Figure 10.

Referring to the accompanying drawings in which like numerals refer to like parts throughout the several views, I have shown diagram- 1936, Serial No. 106,172 (01. 230-58) matically in Figure 1, for the purpose of illustration, a refrigeration system in which the numeral I 0 represents the compressor unit. The refrigerant compressed by the compressor flows through conduit H to the condenser l2 where it condenses into liquid form and flows through conduit l3 to the evaporator [4 under the control of a device, such as a float controlled chamber l5. The refrigerant is evaporated in the evaporator l4 and is withdrawn therefrom by the compressor and compressed. The circuit for the compressor motor is controlled by a suitable switch mechanism l6 which is under the control of a suitable thermostatic device I! associated with the evaporator M, or any other suitable control device.

In the form of the invention shown in Figures 2 to 6, the motor-compressor unit is housed within a hermetically sealed casing l8 having a suction connection l9 and an outlet connection 20 extending therethrough.

Arranged within the casing 18 is a compressor of the reciprocating type and an electric motor for driving the same. These are supported from a casting 2i having an annular wall 22 and outwardly extending, spaced, upper and lower flanges 23 and 24, respectively, eccentrically arranged with respect to the wall 22 and merging into the wall 22 as shown in Fig. 5. Extending between the flanges 23 and 24 opposite the region where they merge into the wall 22 are opposed vertical walls 25 and 26 substantially tangential to the wall 22 and a radial vertical wall 21.

The edges of flanges 23 and 24, the edge faces of the walls 25, 26 and 2'! and a portion of the wall 22 have a tight fitting engagement with the inner surface of the casing I8 and support the casting 2| within the casing adjacent the upper and closed end thereof but spaced therefrom. The flanges 23 and 24 and the walls 22 and 25 form with the wall of the casing a chamber 28. The flanges 23 and 24 and walls 25 and 21 form with the wall of the casing a chamber 29, and similarly, the flanges 23 and 24 and walls 26 and 21 form with the wall of the casing a chamber 30. The space within the casing above the member 2| is in communication with the chamber 28 through an aperture 3| formed in the upper flange 23. The chambers 28 and 29 are in communication with each other through an opening 32 formed in the wall 25 and the chambers 29 and 30 are in communication with each other through an opening 33 formed in the wall 21.

As shown in Figs. and 6, the annular wall 22 extends downwardly and is provided with an integral radial portion 34 which closes in the annular wall 22, except for an opening 35 therethrough adjacent the inlet or suction connection l9, and except for an opening 36 provided by an upwardly extending annular flange 31, coaxial with the wall 22.

Formed integrally with the under side of the portion 34 is a cylinder 38 and crankcase portion 39, and journalled in the wall of the crankcase portion 39 and in a closure plate 40 for the opening 36 is a vertically extending shaft 4| which has a portion 42 extending upwardly beyond the closure plate 40.

Mounted within the bore 43 of the cylinder 38 is a reciprocable piston 44 to which one end of a connecting rod 45 is pivoted. The opposite end of the rod 45 is mounted on an eccentric 46 formed on the shaft 4|, the lower face of the large or eccentric end of the rod has bearing engagement with a finished surface 41 provided on the wall of the crankcase portion 39. Also mounted on the shaft 4|, within the crankcase portion 39, is a counter balance 48 opposed to the eccentric 46.

The eccentric 46 is provided with an opening 49 therethrough and an enlarged recess 50 at its lower side for a purpose which will be later described.

The closure plate 48 is formed with an opening 5| therethrough, and a recess or pocket 52 which communicates with opening 5|. The closure plate 40 also has a passageway 53 leading to the upper bearing surface for the shaft 4| the shaft having a spiral oil groove 54 adjacent the passageway 53. The lower end of shaft 4| is joumalled in crankcase portion 39 which has a spiral oil groove 55 extending around shaft 4|. The lower end of spiral 55 is in open communication with the lubricating oil in the crankcase through slot 55a and the upper end extends to the surface 41 for conducting lubricant to the moving parts of the compressor. Rotation of shaft 4| will cause lubricant in slot 55a. to be flung outwardly into spiral groove 55 by centrifugal force. Thus the lubricant is delivered to the moving parts of the compressor under pressure. Should too much lubricant enter the space 36 the surplus is free to overflow through opening 5| back to the crankcase reservoir and some to the groove 52 for supplying groove 54.

The crankcase portion 39 is provided with an opening 56 for the insertion of the connecting rod 45 and piston 44, which opening is closed by a plate 51.

The outer end of the cylinder bore 43 is closed by a plate 58 having a suction port 59 and a discharge port 69. Associated with the suction port 59 is a suitable valve 6|, such as a reed valve, and associated with the discharge port 60 is a valve 62 of any suitable construction. Associated with the plate 58 is a head member 63 having a discharge passage 64 which communicates with the discharge port 60, and which communicates through a discharge conduit 65 with the outlet connection 20. The head member 63 also has an inlet passage 66 which communicates with the suction port 59, and is provided with a suction conduit 61 which extends through the flange 24 into the chamber 38 as shown in Fig. 5.

The motor for driving the compressor comprises a stator or winding 68 mounted within the annular wall 22 of casting 2|, and a rotor 69 securely mounted .upon the extending portion 62 of the shaft 6| by means of a nut 19 threaded on the end of the shaft portion 42.

a which a rod The rotating element 69 is provided with a plurality of openings 1| extending therethrough, the purpose of which will be described later.

In order to relieve the motor of the starting load of the compressor, I have provided an unloading device of novel construction. Referring to Figures 2, 4 and 6, the cylinder 38 is provided with a vertical passageway 12 extending from the lower side thereof to the cylinder bore 43. Arranged within this passageway is an annular element 13 which forms a valve seat. Connectin into the passageway 12 below the valve seat 13 is a passageway 14 which is provided with a conduit 15 that terminates and opens above the level of liquid in the chamber 18 and below the member 2| so as to by-pass refrigerant discharged from the compressor into the chamber 16 during the starting period when the valve seat 13 is uncovered.

Slidably positioned in the passageway 12, is a slide valve rod 11 having a tapered end 18 which is cooperable with the valve seat to close the by-pass. The lower end of the valve rod 11 projects below the cylinder 38, and is pivoted to a bar 19 adjacent one end which is pivotally supported on a plate 88 secured to the head portion 63.

The bar 19 extends directly below the axis of the shaft 4|, and the other end thereof is guided in a slot 8| formed in the plate 51 and connected by means of a tension spring 82 to a bracket 83 secured to the crankcase portion 39.

The shaft has a coaxial passage 84 within positioned, the lower .end of the rod extending below the-crankcase portion and seating on bar 19, and the upper end of the rod extending above the shaft extension 42. This end of the rod is provided with a spool-like member 86 with which a centrifugal device is associated.

The centrifugal device comprises a pair of vertically arranged U-shaped members 81 having their leg portions normally abutting each other, and which are pivoted upon pins 88 carried by brackets 89 secured to the upper side of the rotating element 69. The members 81 carry pins 90 which are located within the groove of the spool-like member, but at opposite sides of the bottom thereof. Tension springs 9| normally hold the members 81 in abutting engagement.

With the parts of the centrifugal device in the position shown in Figure 5, the rod 85, against the tension of spring 82, holds the valve rod 11 away from the seat 13 to permit refrigerant to by-pass to the chamber 16.

As the motor gains speed, the members 81 pivot outwardly away from each other, gradually, un-

til they engage stops 92 secured to the rotating element 69, at which time the spring 82 moves the bar 19 upwardly and causes the valve rod 11 to close the by-pass. The compressor, then, compresses the refrigerant and circulates the refrigerant through the system.

Since the member 2| has sealed engagement with the wall of the casing, the vaporized refrigerant drawn by the compressor into the chamber 16 from the evaporator, is caused to flow through the opening 35 and, thence, upwardly through the apertures 1| in the rotating element 69,whereby, as a result of which, centrifugal force separates lubricant particles from the vaporized refrigerant. Some of the separated lubricant drains down the outer surfaces of the apertures and into the recess 52 for lubricating the upper bearing of the compressor. The separated lubricant which discharges above the rotating element 88 imment 88 and motor winding 68 to the bottom of the chamber I8.

The system and process of lubricant separation shown and described herein forms no part of the present invention, but is described and claimed in a co-pending application Serial No."106,11 8, filed October 16, 1936, by Lawrence A. Philipp, for Compressor.

Particular attention has been paid in the present invention to compactness, ease of assembly and simpleness of the parts of the compressor unit to the end of obtaining quietness and efficiency of operation.

In the construction shown in Figure 7, the casing is comprised of two parts, namely, an upper portion I00 which houses and supports the stator or motor winding IOI-, and a lowerportion I02 which is shaped to provide a horizontally arranged cylinder I03 and crankcase portion I04 which is open at the upper side. The upper and lower portions are provided with hublike portions I05 and I06, respectively, the portion I08 being provided with a bushing I07.

' Having its ends journalled in the portion I05 and bushing I 01 is a shaft I08 having an eccentric I08 thereon.

A piston H0 is reciprocably mounted in the bore iII'of the cylinder I03 and is connected by means of a connecting rod II2 with the eccentric I09, the lower side face of the rod II2 being slidably engaged with a bearing plate II3 supported on the end face of the portion I05.

The open side of the crankcase portion I04 is closed by means of an inverted cup-shaped portion II4 of sheet metal having an opening Ii5 through which the shaft I08 extends, and an opening II6 through the upper side thereof. The

.shaft I08 above the portion II4 carries the rotor or motor winding III. I

The bore III of the cylinder I03 opens through the lower casing portion I02 and is closed by a valve plate I I8 having intake and discharge ports H9 and I20 respectively. Associated with the ports II 8 and I20 are valves I2I and I22, respec tively, of any suitable construction and a head portion I23 having an inlet passageway I24 and an outlet passageway I25. The inlet passageway communicates with the port H0 and with a passageway I26 provided in the casing portions I02 and I00 which leads to the space I21 above the motor winding. The inlet I28 for the hermetically sealed chamber formed by the casings I00 and I02 is provided in the upper casing I00.

The head I23 is provided with an outlet connection I29 within which is positioned a valve seat I 30 communicating with the discharge passageway I25. Surrounding the valve seat I30 is an annular sleeve I3I against which a valve plate I32 is normally urged into engagement by a compression spring I33. Interposed between the valve plate I32 and the valve seat I30 is a spring I34 of less weight than the spring I33.

The discharge passage I 25 also communicates with a passageway I35 which in turn communicates with a passageway I36 provided in a member I31 mounted within the lower end of the shaft I08 to rotate therewith.

The passageway I38 communicates through the shaft I08 with a chamber I38 formed in a member I39 secured to rotate with the shaft I08 and which also acts as a counterbalance. The outer end of the .chamber I38 is provided with with the bottom of that portion of the chamber surrounding the crankcase portion I04 and forming a lubricant reservoir. The passageway I 41 leads to a recess I48 formed in the bushing I01. The shaft I08 is also formed with a passageway I48 openingthrough its upper end and communicating with a passageway or groove I50 formed in the member I31, the groove I50 in turn opening into an aperture I5'I provided through the lower end of the shaft I08, which end is formed with a spiral thread I52 that extends to the bottom of the shaft aperture I 5|. Also, the eccentric I09 is formed with a passageway I54 leading to the groove I50 and to its bearing surface so that lubricant flowing through the groove I50 will flow outwardly by centrifugal force to lubricate such passageway.

During rotation of the shaft I08, the spiral thread I 52 causes lubricant to be drawn through passageway I41? for lubricating the bearing surface at the lower end of the shaft and to also flow upwardly through the passageway I49 to the space I53 above the end of the shaft I08 to lubricate the upper bearing surface thereof.

In the operation of the compressor shown in Figures 7 and 8, the motor is relieved of the starting load of the compressor, during the starting period, by reason of the fact that the spring I45 holds the valve portion I43 away from the seat I40 with the result that the refrigerant, which, during normal operation, would be compressed, by-passes through passageways I25, I35, I38, I44, and I 40 into the crankcase and thence through opening II8 into-the refrigerant chamber. As the motor gains speed, the weight I4I gradually moves outwardly by centrifugal force and closes the valve seat I 40. During the starting period the valve plate passage I30, but when the motor attains its normal speed, and when the valve seat I 40 is closed by member I42, the compressed refrigerant flows through the opening in the valve seat I30 and thence to the condenser or evaporator.

The suction created by'the compressor draws vaporized refrigerant and lubricant through the inlet I28 and due to the bafiling effect provided by the upper portion of the motor winding IOI and a vane I55 formed in the upper end of the casing portion I00, entrained lubricant particles are separated from the vaporized refrigerant and drain to the reservoir through the annular space between the rotating element III and motor winding IOI, the refrigerant flowing through passageway I26 to the compressor.

In the construction shown in Figures 9, 10 and 11, I have shown a rotary type compressor, employing an unloader device of the general character shown in Figures 2, 4, and 5. In this construction, an annular casting 200 having a wall 20I extending across the same, intermediate its ends, is provided, the open ends thereof being closed in by upper and lower closure caps 202 and 203, respectively, and the wall 20I forming an upper or motor compartment 204, and a I00 and to the I 32 closes the discharge lower or compressor compartment 205. The stator or motor winding 200 is supported by the casting 200 in the upper compartment 204.

Secured to the under side of the'wall 20| is a pump or compressor housing 201 having a cylindrical opening 208 forming the compression chamber within which the rotary element M0 is mounted. The shaft 2 is hollow and is journalled above the housing 201 in the wall 20! and below the housing in a bushing 2l2 carried by a pair of abutting members H3 and 2 l4 secured to the housing 201.- The shaft 2 is formed with an eccentric portion 2| 5 extending within the rotary element 210 for operating the same, the rotary element 210 having a vane-like portion 216 slidably mounted in an oscillatable element 2" carried by the housing 201.

. Opening into the chamber 208, at one side of the vane-like member 2l6, through the member 2l3 is an outlet 2l8 provided with a valve seat HQ with which a valve 220 is associated, the member 2 having a passageway 22!, surrounding thevalve 220, which opens into a passageway 222 formed in the member 2I3, housing 201 and wall 20I, and opening into the motor cham-' her 204.

Opening into the chamber 208 at the opposite side of the vane-like member 210 through the wall 20l is an inlet passage 223 which opens through the casting 200 and is provided with an inlet connection 224.

Arranged at this same side of the vane-like member 216 and in the member M3 is an aperture 225 having a valve seat 226, the aperture opening into the discharge passageway 22!, and slidably mounted in the member 2 coaxial with the valve seat 226 is a valve rod 221 having a, tapered end 228 arranged to cooperate with the valve seat 226 to close the passage therethrough. The valve rod 221 is pivoted to a bar 229 extending directly below the opening in the shaft 2H, the bar 229 being pivoted at one end to the under side of member 2, and provided at its opposite end with a tension spring 230 which is attached to apin 23l extending outwardly from the housing 201.

A rod 232 is loosely arranged within the shaft 2 and its lower end engages the bar 229. The upper end of the rod 232 extends above the end of the shaft 2!! and is provided with a spoollikemember 233 securely fixed thereto.

The upper vend of the shaft 2 carries the.

rotor or rotating element 234 of the motor and secured to the rotor are brackets 235 to which a pair of weighted elements 236 are pivoted. The weighted elements 236 are urged into abutting engagement by means of a spring 231. The elements 236 carry pins 238 which seat in the groove of the spool-like member 233.

With the weighted members 233 in the position shown in Figure 9, the rod 232, through the medium of the bar 229 holds the valve rod 221 away from the seat 226, so that during the starting period the refrigerant entering the suction side of the compressor by-passes through the aperture in the seat 226 and through passages 22l and 222. As the motor gains speed, the weighted members 236 pivot away from each other, allowing spring 230 to move the valve rod 221 to close the seat 226, whereby the incoming refrigerant is compressed and discharged into the motor chamber 204 where it passes through apertures 239 provided through the rotor 234.

Due to centrifugal force, lubricant particles are expelled from the compressed refrigerant and drain back through the space between the rotating element 234 and motor winding 203, the refrigerant passing through a connection 240 arranged in the upper closure 202.

The wall 2! is provided with apertures 24! which place the motor and compressor chambers 204 and 205 in communication with each other.

In each of the constructions shown and described, the compressor-motor units are hermetically sealed, compact and easy to assemble.

While I have shown and described several forms of my-invention, many changes may be effected therein, without departing from the spirit and scope thereof, as set forth in the appended claims.

What I claim is:

1. In a refrigeration apparatus, a sealed casing, a horizontally positioned compressor cylinder within said casing, a piston reciprocably mounted in said cylinder, a vertical journalled shaft in said casing having an eccentric portion. a connecting rod having one end connected with said piston and its opposite end connected with said eccentric, and a stationary supporting element having bearing and sole supporting engagement with the under side of said last-mentioned end of said connecting rod throughout the area of said under side and on which element said end slides.

2. In a refrigeration apparatus, a sealed cas ing, a horizontally positioned compressor cylinder within said casing, a piston reciprocably mounted in said cylinder, a vertical journalled shaft in said casing having an eccentric portion, a connecting rod having one end connected with said piston and its opposite end connected with said eccentric, and a stationary supporting element having bearing and sole supporting engagement with the under side of said last mentioned end of said connecting rod throughout the area of said under side and on which element said end slides. said apparatus having means for lubricating the bearing surface of said supp rting element.

3. In a refrigeration apparatus, a sealed annular casing having a vertical axis and forming a low pressure chamber having an opening for receiving low pressure refrigerant, the lower portion of said chamber forming a lubricant reservoir, an annular element. having a vertical axis and having an outwardly extending eccentric flange, said flange having a tight fitting engagement with the inner wall of said casing for supporting the element within the casing with the axis of said element offset with respect to the axis of said casing, said element having an integral radial portion at one end thereof to provide a closure therefor and having integral cylinder and crankcase portions in said radial portion, a motor winding carried by said annular element, a vertical shaft journaled in said crankcase portion of said radial portion and having an eccentric thereon, a piston reciprocably mounted in said cylinder, a connecting rod connected to said piston and having an apertured end surrounding said eccentric, said apertured end having slidable bearing engagement with and being supported solely by the bottom wall of said crankcase portion, said shaft extending upwardly through said crankcase portion and axially within said winding, a rotatable motor element within said winding and fixed to said shaft, a head for said cylinder portion disposed beneath said eccentric flange, said head having an inlet open- 15 a low pressure chamber having ing, and conduit means connected with said inlet opening and communicating with the space above said eccentric flange.

4. In a refrigeration apparatus, nular casing having a vertical axis and forming a low pressure chamber having an opening for receiving low pressure refrigerant, the lower portion of said chamber forming a lubricant reservoir, said casing opening communicating with said reservoir, an annular element having a vertical axis and provided with an outwardly extending eccentric flange, said flange having a tight fltting engagement with the inner wall of said casing for supporting the element within the casing with the axis of said element offset with respect to the axis of said casing, said element having an integral radial portion at one end thereof to provide a closure therefor, and having integral cylinder and crankcase portions in said radial portion, said annular element having an opening therein to provide open communication between the lubricant reservoir and the space above said eccentric flange containing the low pressure refrigerant, a motor winding carried by said annular element, a shaft journaled in said crankcase portion of said radial portion and having an eccentric thereon, a piston reciprocably mounted in said cylinder, a connecting rod connected to said piston and having an apertured end surrounding said eccentric, said apertured end having slidable bearing engagement with and being supported solely by the bottom wall of said crankcase portion, said shaft extending upwardly through said crankcase portion and axially within said winding, a rotatable motor element within said winding and having driving connection with said shaft, a head for said cylinder portion disposed beneath said eccentric flange, and conduit means connected with said head and communicating with the space a sealed anabove said eccentric flange for supplying refrigerant to the cylinder.

5. In a, refrigeration apparatus, a sealed annular casing having a vertical axis and forming an opening for receiving low pressure refrigerant, the lower portion of said chamber forming a lubricant reservoir, an annular element having a vertical axis and provided with an outwardly extending eccentric flange, said flange having a tight fitting engagement with the inner wall of said casing for supporting the element within the casing with the axis of said element ofiset with respect to the axis of said casing, said element having an integral radial portion at one end thereof to provide a closure therefor and having integral cylinder and crankcase portions in said radial portion, a motor winding carried by said annular element, a'shaft journaled in said crankcase portion of said radial portion and having an eccentric thereon, a piston mounted in said cylinder operatively connected to said eccentric, said shaft extending upwardly through said crankcase portion and axially within said winding, a rotatable motor element within said winding and having driving connection with said shaft, a head for said cylinder portion disposed beneath said eccentric flange, said head having an inlet opening, and conduit means connected with said inlet opening and communicating with the space above said eccentric flange.

6. In a refrigeration apparatus, a sealed annular casing having a vertical axis and forming a low pressure chamber and having an opening for receiving low pressure refrigerant, the lower portion of said chamber forming a lubricant reservoir, said casing opening communicating with said reservoir, an annular element having a vertical axis and provided with an outwardly extending eccentric flange, said flange having a tight fitting engagement with the inner wall of said casing for supporting the element within the casing with the axis of said element offset with respect to the axis of said casing, said element having an integral radial portion at one end thereof to provide a closure therefor and having integral cylinder and crankcase portions in said radial portion, said annular element having an opening therein to provide open communication between the lubricant reservoir and the space above said eccentric flange, a motor winding carried by said annular element, a shaft journaled in said crankcase portion of said radial portion and having an eccentric thereon, a piston mounted in said cylinder operatively connected'to said eccentric, said shaft extending upwardly through said crankcase portion and axially within said winding, a rotatable motor element within said winding and having driving connection with said shaft, a head for said cylinder portion disposed beneath said eccentric flange, said head having an inlet opening, and conduit meansconnected with said inlet opening and communicating with the space above said eccentric flange.

'7. In a refrigeration apparatus, a sealed annular casing having a vertical axis and forming a low pressure chamber having an opening for receiving low pressure refrigerant, the lower portion of said chamber forming a lubricant reservoir, an annular element having a vertical axis and provided with an outw rdly extending eccentric flange, said flange having a tight fitting engagement with the inner wall of said casing for supporting the element within the casing with the axis of said element ofiset with respect to the axis of said casing, said element having an integral radial portion at one end thereof to provide a closure therefor and having integral cylinder and crankcase portions in said radial portion, a motor winding carried by said annular element, a vertical shaft journaled in said crankcase portion of said radial portion and having an eccentric thereon, a piston reciprocably mounted in said cylinder, a connecting rod connected to said piston and said eccentric, said shaft extending upwardly through said crankcase portion and axially within said winding, a rotatable motor element within said winding and fixed to said shaft, a head for said cylinder portion disposed beneath said eccentric flange, said head having an inlet opening, and conduit means connected with said inlet opening and communicating with the space above said eccentric flange.

8. In a refrigeration apparatus, a sealed annular casing having a vertical axis and forming a low pressure chamber and having an opening for receiving low pressure refrigerant, the lower portion of said chamber forming a lubricant reservoir, said casing opening communicating with said reservoir, an annular element having a vertical axis and provided with an outwardly extending eccentric flange, said flange having a tight fitting engagement with the inner wall of said casing for supporting the element within the casing with the axis of said element offset with respect-f; to the axis of said casing, said element having an integral radial portion at one end thereof to provide a closure therefor and having integral cylinder and crankcase portions in said radial portion, said annular element having an opening therein to provide open communication between the lubricant reservoir and the space above said eccentric flange, a motor winding carried by said annular element, a vertical shait journaled in said crankcase portion of said radial portion and having an eccentric thereon, a piston reciprocably mounted in said cylinder, a connecting 1Q rod connected to said piston and said eccentric,

said shaft extending upwardly through said crankcase portion and axially within said winding, a rotatable motor element within said winding and fixed to said shalt, a head for said cylinder, portion disposed beneath said eccentric flange, said head having an inlet opening, and conduit means connected withsaid inlet opening and communicating with the space above said eccentric flange.

RALPH W. DOEG. 

